Gas-engine.



No. 783,983. PATENTED FEB. 28, 1905.

' c. E. SARGENT.

GAS ENGINE.

APPLICATION FILED APE.27.1900.

4 SHEETS SHEET 1.

PATENTED FEB. 28, 1905.

C. B; SARGENT.

GAS ENGINE.

APPLIUATION FILED APR.27.1900.

4 SHEETS-SHEET 2.

m n m Z.

II I IIIILIMIII I I I /iilzwmw:

@AX MM z /im/ PATENTED FEB. 28, 1905.

No. 783,983v

G. E. SARGENT.

GAS ENGINE.

APPLIUATION FILED APR. 27.1900.

No. 783,983. PATENTED FEB. 28, 1905. I U E. SARGENT.

GA$ ENGINE.

APPLICATION FILED-APE. 27,1000.

-1 sums-2mm 4.

tie. 783,983.

Patented February 28, 1905.

Parent CHARLES E. SAltGl lNT,

OF CHICAGO, ILLINOIS.

GAS-"IEl' rlGilNIEn SPECIFICATION forming part of Letters Patent No. 783,983, dated February 28, 1905.

Application filed April 27, 1900. $erial No. 14,553.

To II/N/ whom, it may concern:

Be it known that 1, CHARLES E. SARGENT, a citizen of the United States of America, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Gas-Engines, of which the following is a specification.

My invention relates to certain improvements in gas-engines designed to render the same more convenient and easy of operation, the invention being directed particularly to certain details, which will be fully described and clearly defined below.

In the drawings, Figure 1 is a side elevation of a complete engine; Fig. 2, a vertical longitudinal section of the base thereof; Fig. 3, a transverse vertical section of one of the cylinders, showing the valve mechanism, the section being in plane 3 b of Fig. 1 and the view from left to right of the latter figure. Fig. et is a side elevation of one portion of the valve-operating cam; Fig. 5, a side elevation of the other portion. Fig. 6 is an enlargement of that portion of Fig. 1 adjacent to one of the valveoperating cams. Fig. 7 is a de tail vertical section similar to Fig. 3, but taken in the plane 7 7 of Fig. 1. Fig. 8 is a horizontal section looking downward upon the plane 8 8 of Fig. 7. Fig. 9 is a detail section in plane 9 9 of Fig. 7 looking in the direction of the arrow 9, the view showing merely the outer end of the igniter supporting block and certain of the parts secured thereto. Fig. 10 is a view of the inner end of said block, showing the same removed from the cylinder and showing the parts upon the inner end of the block. Fig. 11 is a vertical section in line 11 11 of Fig. 8, showing certain details in connection with the igniter. Fig. 19. is a longitudinal horizontal section in line 12 12 of Fig. 1. Fig. 13 is a vertical transverse section in line 13 13 of Fig. 12. Fig. 14: is a longitudinal vertical section in the crooked line 14 1.4 of Fig. 12 looking in the direction of the arrow 14, and Fig. 15 is a longitudinal vertical section in line 15 15 of Fig. 12 looking in the direction of the arrow Referring to these drawings, A is a hollow base extended in the form of asubbase a, also hollow and separated from the main portion of the base by a partition rt. Within the main portion of the base is a reservoir (4, closed with the exception of certain pipes which enter it, and within the subbase is a reservoir a, open to the atmosphere through a series of perforations rt". Upon the base is secured a hollow framework "3, extended to inclose the connecting-rod, the crank, and the crank-shaft and supporting suitable bearings for said shaft. The shaft is lettered C and has fast upon it a governor-pulley 0, provided with a suitable governor c. This governor may be of any of the well-known types of gasengine governors, the object of which is to control the speed of the engine by shifting the time of the opening of the inlet and exhaust ports or by shifting the time of the ignition of the charge. The particular form herein illustrated is that covered by my application for governor for gas-engines, filed April 27, 1900, Serial No. 1%,551). The crankside shaft D. the gearing here being inclosed in a hood or cap (Z, said side shaft serving to rotate a series of valve-operating cams (7 d and a series of igniteroperating disks 1/. It also (meratcs an air-pump of suitable construction (I To the end of the frame 1) is secured one end of a cylinder l), to the other end of which is fastened a distancedread 1i", resting upon the subbase. by means of a support and itself carrying another cylinder, ll. To these cylinders are secured a series of brackets (Z in which the side shaft is journaled. The portion of the shaft alongside of the cylinder B is connected to the remainder by a sliding coupling (1", by means of which the end portion of the shaft is permitted to move longitudinally. The shaft adjacent to this coupling is provided with a groove with which engages a vertical lever (Z pivoted at (1 to a bracket It, secured to the subbase. By means of this lever the end portion of the shaft may be moved longitmlinally to change the position of the cams It'd with relation to the valve-operating devices. One of the valves is shaft is connected by suitable gearing with a y the atmosphere.

shown in Fig. 3 by means of a transverse vertical section. It is located in a valve-chamber beneath the cylinder and works in a vertical cylindrical bushing (1, containing exhaustports 0' and admission-ports a, the latter being for the air and gas, respectively. \Vithin the bushing slides a hollow cylindrical valve E, guided by means of a hollow stem 0*, working in the central boss of a cap 6, which closes the lower end of the bushing. The cap extends inward and upward and returns downward in the form of a central boss J, which carries a coiled spring 0 pressing downward upon a nut a, screwed to the end of the pistonvalve stem and forming, together with a nut e below it on the stem, a means of engagement for the forked end fof a val ve-operating lever F, pivoted at f to the bracket (Z and carrying at its outer end a roller f adapted to run upon the valve-operating cam. spring 0 tends to crowd downward the forked end of the lever and hold the roller upon whichever cam happens to be in position for engagementtherewith. The piston-valve contains inlet-ports a a and has at its upper end an outside groove 0, adapted when raised into proper position to connect the exhaust-ports with the interior of the valve-chamber and with the cylinder. Upon the top of the piston-valve rests a puppet-valve Gr, guided by a stem g in the hollow stem of the piston-valve and adapted to be raised by pressure below it and forced downward by pressure above it. It is also adapted to seat upon the top of the bushing when the piston-valve is lowered. The exhaust-port c communicates with a chamber H, which connects, as shown in Fig. 15 and Fig. 13, with an exhaust-pipe h, open to The inlet-port a connects with a chamber 1, communicating with a pipe J, as seen in Fig. 1 said pipe extending, as seen in Figs. 1 and 2, into the subbase a, so as to be open to the atmosphere through the per;

forations a. The pipe J contains an ordinary threeway valve K, adapted to cut off the connection with the subbase and at the same time establish connection with a branch pige Z", opening into the reservoir (I. of the main portion of the base, as seen in Fig. 2.

The admission-port e" connects with a chamber M, from which a pipe 217., containing a stop-cock 111 leads to a suitable reservoir for a supply of gas or other combustible material.

The valve-operating levers F have vertical arms f adapted to be engaged by eccentrics f", rotated by levers and suitably supported and pivoted upon the brackets d. These eccentrics are intended to bear upon the arms f to oscillate the levers sufticiently to hold the rollers away from the cams and the valves in their uppermost positions, in which the exhaust ports and passages are open between the cylinder and the atmosphere.

The.

Figs. at and 5. The cam r? is shown in Fig. 4c and bears a depression 1', which enables the roller to rise and the valve to drop so as to open the inlet-ports during part of the admission-stroke. As the cam advances in the direction of the arrow the portion a" engages the roller and holds the valve so as to close both the inlet and the exhaust ports during whatever remains of the admission-stroke, all of the compression-stroke, and the working stroke of the engine. The raised portion 7' then crowds the roller down, raising the valve to open the exhaust-port during the exhauststroke. The cam (Z has two depressions r upon opposite sides, which allow the inletports to open at the commencement of each forward stroke of the engine, two opposite portions 7-, which close both the inlet and exhaust ports during the remainder of each forward stroke, and two opposite portions which hold the exhaust open during each entire backward stroke of'the engine.

The air-pump (1", operated by the side shaft D, forces air through a pipe (1 into the reservoir (If within the hollow base, said air being for use in starting the engine, as hereinafter described.

A block N (see Fig. 10) is let into the side of the cylinder, as seen in Fig. 7, terminating within the latter in the valve-chamber, and said block contains a rock-shaft n, terminating at the inner end of the block in a coned enlargement a, seated in the block and bearing a wiping spring-arm n brought by the rocking of the shaft into contact with the inner rounded end 0 of an electrode 0, the outer end of which is connected with a suitable source of electricity. The electrode is inclosed in an insulated bushing 0', itself inclosed in a screw-plug 0 threaded in the block, the electrode being held within the bushing by means of a head I)" at the inside end and a nut 0 bearing upon the outside end of the bushing. The electrode is cylindrical in form, so as to be rotatable in the bushing to bring new portions of its surface into contact with the wiping-arm. The elasticity of the spring-arm causes the latter to bear with a yielding force upon the inner end of the elec trode and make a perfect contact therewith.

"Upon the portion of the rockshaft 21 without the cylinder is a coiled spring 7), having one end, p, fastened in the block N and the other end fast at p in a collar P, secured by a setserew p to the shaft and adjustable both longitudinally and angularly upon the latter. The spring p is put under torsional and longitudinal tension, so as to draw the coned end n. of the rock-shaft to its seat and also to turn the wiping-arm n away from the electrode 0. Upon the outer end of the rock-shaft is secured a crank-arm 0", (best seen in Fig. 6,) to the outer end of Wl11Cl1 is secured a push-bar 0", (see Fig.

\ n u l u i I The shape of: the cams (Z' d" 18 shown in l 11,)rest1ng upon the 1gn1ter-operatmg disk (Z".

IIO

This end oi the rock-shaftis pivoted in a bracket g, the lower part of which has a slotted extension g, (see Fig. 11,) beveled at (1", and a plate 0 secured to the side of the push-bar, is bent at an angle at o to engage this beveled part of the bracket. The slot in the bracket extends backward from the push-pin sufliciently to allow a limited movement of the latter in the backward direction. The pushpin is raised by means of a lug d, inclined upon the forward side with reference to the direction of movement of the cam and abrupt upon the rear side. This lug raises the push-pin against the tension of the spring 1) to bring the wiping-arm into contact with the electrode, and as the push-pin rides off of the top of the lug the contact is abruptly broken, causing the spark. In case of a backward movement of the igniter-disk the. push-pin is crowded backward by the lug d, which, it will be seen, has one sloping side and one radial side, and is raised by the bent portion 0 of the plate sufliciently to clear the top of the lug. The lug (Z Z presses the push pin backward, and the wedging action of the bent portion 0 against the beveled portion of the frame (1 will raise the push-pin exactly as it the igniter-disk were revolving in the proper direction and the pin had been merely forced upward by the wedging action of the igniter-disk. The wiping-arm w is secured to the inner end of the rock-shaft by means of a screw a so as to be removable therefrom for repairs or in case it needs to be replaced by a new one.

During the ordinary working of the engine the air-pump (Z forces air into the reservoir of, so that a supply of compressed air is al- "ays stored inside the reservoir with which to start the engine. To do the latter, the lever (Z is thrown to the left, bringing the cams (W upon the lett-hand cylinder beneath the rollers f correspondingthereto. The levers f, corresponding to the right-hand. cylinder, are raised into the position shown in Fig. 3 to open the exhaust-valves of said cylinder. The pulley is turned until one of the depressions 0* upon the cam (Z at one end of the cylinderB" passes beneath the rollerf and permits the inlet-ports to open. The three-way cock K is turned to open communication between the reservoir a and the valve, and the compressed air rushes into that end of the cylinder B The corresponding cam at the other end of the cylinder is so arranged upon the shaft as to bring one of its exhaust portions beneath the roller at this time and open the exhaustport at that end of the cylinder. The air drives the piston forward, is out ofl at part 01" the stroke, expands during the remainder, and at the COl'IlIl'lt-ZDCBHIGDE of the return stroke is allowed. to escape through the exhaust-valve, which opened by the portion 1''. When this occurs, the inlet-valve at the opposite end 01 ner of the ordinary compressed-air or steam engine. After this has been accomplished the handle (1 1s swung lnto the position seen .in Fig. 1 and the parts are ready to operate as in a tour-cycle engine. Thus in starting air may operate one cylinder while the piston of the other runs idle, the exhaustwalves being open, and when proper momentum has. been attained the valves of the second engine may be shifted and that cylinder may be brought into action as a four-cycle engine, if desired, without meantime ceasing to operate the other by compressed air.

The igniter and the actuating devices therefor shown and described in this specification are not claimed herein, inasmuch as the same have been made the subject of a divisional application, liled November 3, 1900, Serial No. 35,371.

The above description-hasbeen made as specilic as possible in order that it may be perfeetly clear; but it is not the intention to thereby limit the invention in any manner to the exact details described, nor to any arrangement or combination oi the same, except such as is hereinafter set forth.

I claim as new and desire to secure by Letters Patent 1. In an internal-combustion engine, the combination with a combustion-cylinder having a valve-chamber, of a cylinder-valve lying in one part of the chamber and controlling the inlet and exhaust passages, an ignition device lying in another part of the chamber, and an independently-movable puppet-valve for closing communication between the two parts of the chamber.

2. M an internalcombustion engine, the combination with two tandem double-acting cylinders, a single piston-rod, two pistons mounted on said rod and playingin said cylinders, an explosion-chamber in each end of each cylinder, a combined piston and puppetvalve in each of said cxplosion-chambers,with suitable devices for actuating the valves of one cylinder so as to produce a compressed air engii'ie and actuating the valves of the other cylinder as a 'lour-cycle engine, substantially as described.

3. The combination with two tandem cylinders each having an explosion-chamher in each end, of two pistons carried upon a single piston-rod and each separating the explosionspaces in one oi the cylinders, suitable valves for each cylinder, means for operating each cylinder as a tour-cycle cylinder, and means for at will operating one cylinder as a compressed-air engine.

4:. In an internalcombustion engine, the combination with an engine-frame, tandem cylinders, a hollow inclosed base, a sidesha'lt,

an air-pump operated by said shaft, a reserhand, at Chicago, in the county of Cook and voir for compressed air, suitable connections l State of lllinois, this 19th day of April, A. 1); between said pump and said reservoir, and a 1900. three-way cock connecting one cylinder with CHARLES E. SARGENT. 5 the reservoir and with the atmosphere as de- \Vitnesses: 1

sired, substantially as described. i In witness whereof I have hereunto set my CHAS. O. SHERVEY, S. BLIss. 

